Product Description:

The 1MS310B-6B-A1/S012 is a stator module produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Supplied as the stationary half of a frameless spindle package, it is installed directly in the machine spindle housing and surrounds a separately mounted rotor. By generating a rotating magnetic field within that assembly, the unit provides the driving torque required for milling, drilling, and grinding operations while avoiding the bulk of a fully housed motor. Its compact build helps shorten spindle heads and allows feedback devices to be placed closer to the working tool for improved positioning accuracy.

Thermal management is handled by liquid cooling, and the stator body includes an aluminum cooling jacket that channels coolant along the lamination stack to keep winding temperature within acceptable limits. Power and feedback conductors are organized inside a 1.5 m loom and are routed through the stator end, which helps reduce installation time and prevents cable loops inside the headstock. The magnetic core corresponds to frame size 310, giving the assembly a large active diameter that supports high torque density at elevated speeds. This layout is well suited for compact machining centers and retrofit spindle assemblies where space inside the housing is limited.

The electromagnetic arrangement identified as winding variant 6B sets the conductor gauge and turn count, matching the stator impedance to compatible 1MB drive modules for fast current response. Axial length is set by motor length code B, allowing predictable bearing spacing and preload when the stator is paired with a matching rotor. The unit is a stator for a 1MB frameless spindle motor, and it is fully impregnated and balanced to help minimize vibration at high rotational speeds. That combination supports accurate running behavior during continuous-duty machining cycles.